When you go Write Image using ImageBurn, there is a little button with picture of book, you press that end set the Book type. By setting Book type it writes the image in a DVD-Rom compatiblae format giving better compatibility when played on other devices outside of computer.

First question....what kind of burner you have?
second.....why do you want to strain your wii laser with dvd+r?

Cause the only way to change the booktype settings for your burner, is to match the burner brand in the tabs above the imgburn software,
Click on the right tab.
Select what media you are changing to DVDROM i.e dvd+r
select change to dvdrom and select change...and that is it.

Thanks everyone for the great support.
Hope to hear from you soon, cause i'm getting ready to retire from the modding scene.
Gonna start a new profession.